Joshua A. Frieman

Joshua A. Frieman studies the nature of dark energy, the early universe, gravitational lensing, the large-scale structure of the universe, and supernovae as a measure of distance in the universe. He seeks to understand how and why the expansion of the universe is accelerating. Prof. Frieman is a co-founder and former director of the Dark Energy Survey, an international collaboration of more than 300 scientists from 25 institutions on three continents who investigate this phenomenon. The collaboration built a 570-megapixel camera for the Blanco Telescope at the Cerro Tololo Inter-American Observatory in Chile.

A member of the American Academy of Arts and Sciences, an honorary fellow of the Royal Astronomical Society, and a fellow of the American Physical Society and the American Association for the Advancement of Science. Prof. Frieman also led the Sloan Digital Sky Survey Supernova Survey, which discovered 500 type Ia supernovae for cosmological studies. He also led the division of particle physics at Fermi National Accelerator Laboratory.

Frieman Stories